From dac3cd622f82c127fce8e57004e540c0eb6024a5 Mon Sep 17 00:00:00 2001
From: KUDr <kudr@openttd.org>
Date: Fri, 23 Feb 2007 20:51:10 +0000
Subject: (svn r8864) -Codechange: make ClrBitT(), SetBitT() and ToggleBitT
 more like CLRBIT() and so on (modify value of the first parameter instead or
 returning the result)

---
 src/helpers.hpp  | 18 ++++++------------
 src/rail.h       |  4 ++--
 src/rail_cmd.cpp |  6 +++---
 src/town_cmd.cpp |  2 +-
 4 files changed, 12 insertions(+), 18 deletions(-)

(limited to 'src')

diff --git a/src/helpers.hpp b/src/helpers.hpp
index 5f378803a..fb5aeb5f8 100644
--- a/src/helpers.hpp
+++ b/src/helpers.hpp
@@ -138,25 +138,19 @@ template <typename Tenum_t> struct TinyEnumT
 	}
 };
 
-template <typename T> FORCEINLINE T ClrBitT(T t, int bit_index)
+template <typename T> void ClrBitT(T &t, int bit_index)
 {
-	int val = t;
-	CLRBIT(val, bit_index);
-	return (T)val;
+	t = (T)(t & ~((T)1 << bit_index));
 }
 
-template <typename T> FORCEINLINE T SetBitT(T t, int bit_index)
+template <typename T> void SetBitT(T &t, int bit_index)
 {
-	int val = t;
-	SETBIT(val, bit_index);
-	return (T)val;
+	t = (T)(t | ((T)1 << bit_index));
 }
 
-template <typename T> FORCEINLINE T ToggleBitT(T t, int bit_index)
+template <typename T> void ToggleBitT(T &t, int bit_index)
 {
-	int val = t;
-	TOGGLEBIT(val, bit_index);
-	return (T)val;
+	t = (T)(t ^ ((T)1 << bit_index));
 }
 
 #endif /* HELPERS_HPP */
diff --git a/src/rail.h b/src/rail.h
index ae651ebe5..7f3d4330d 100644
--- a/src/rail.h
+++ b/src/rail.h
@@ -261,7 +261,7 @@ static inline Track RemoveFirstTrack(TrackBits *tracks)
 {
 	if (*tracks != TRACK_BIT_NONE && *tracks != INVALID_TRACK_BIT) {
 		Track first = (Track)FIND_FIRST_BIT(*tracks);
-		*tracks = ClrBitT(*tracks, first);
+		ClrBitT(*tracks, first);
 		return first;
 	}
 	return INVALID_TRACK;
@@ -274,7 +274,7 @@ static inline Trackdir RemoveFirstTrackdir(TrackdirBits *trackdirs)
 {
 	if (*trackdirs != TRACKDIR_BIT_NONE && *trackdirs != INVALID_TRACKDIR_BIT) {
 		Trackdir first = (Trackdir)FindFirstBit2x64(*trackdirs);
-		*trackdirs = ClrBitT(*trackdirs, first);
+		ClrBitT(*trackdirs, first);
 		return first;
 	}
 	return INVALID_TRACKDIR;
diff --git a/src/rail_cmd.cpp b/src/rail_cmd.cpp
index 18eb0f1d0..437d19463 100644
--- a/src/rail_cmd.cpp
+++ b/src/rail_cmd.cpp
@@ -450,7 +450,7 @@ static int32 ValidateAutoDrag(Trackdir *trackdir, TileIndex start, TileIndex end
 		(trdy >= 0 && dy < 0)
 	) {
 		if (!HASBIT(*trackdir, 3)) { // first direction is invalid, try the other
-			*trackdir = SetBitT(*trackdir, 3); // reverse the direction
+			SetBitT(*trackdir, 3); // reverse the direction
 			trdx = -trdx;
 			trdy = -trdy;
 		} else { // other direction is invalid too, invalid drag
@@ -513,7 +513,7 @@ static int32 CmdRailTrackHelper(TileIndex tile, uint32 flags, uint32 p1, uint32
 		tile += ToTileIndexDiff(_trackdelta[trackdir]);
 
 		// toggle railbit for the non-diagonal tracks
-		if (!IsDiagonalTrackdir(trackdir)) trackdir = ToggleBitT(trackdir, 0);
+		if (!IsDiagonalTrackdir(trackdir)) ToggleBitT(trackdir, 0);
 	}
 
 	return (total_cost == 0) ? CMD_ERROR : total_cost;
@@ -777,7 +777,7 @@ static int32 CmdSignalTrackHelper(TileIndex tile, uint32 flags, uint32 p1, uint3
 		signal_ctr++;
 
 		// toggle railbit for the non-diagonal tracks (|, -- tracks)
-		if (!IsDiagonalTrackdir(trackdir)) trackdir = ToggleBitT(trackdir, 0);
+		if (!IsDiagonalTrackdir(trackdir)) ToggleBitT(trackdir, 0);
 	}
 
 	return error ? CMD_ERROR : total_cost;
diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index b79b5e211..dd5da52fe 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -730,7 +730,7 @@ static int GrowTownAtRoad(Town *t, TileIndex tile)
 
 		// Exclude the source position from the bitmask
 		// and return if no more road blocks available
-		mask = ClrBitT(mask, (block ^ 2));
+		ClrBitT(mask, (block ^ 2));
 		if (mask == 0)
 			return _grow_town_result;
 
-- 
cgit v1.2.3-70-g09d2